Substation system



Oct. 15, 1929. J. H. MASON 1,732,135

SUBSTATION SYSTEM Filed Dec. 5, 1925 J/i/v EJ960274 ,5 kax/Qziarne Patented Get. 15, 1929 UNITED STATES JOHN H. MASON, OF PHILADELPHIA, PENNSYLVANIA SUBSTATION SYSTEM Application filed December 5,1925. Serial No. 73,438.

My invention relates to telephoneapparatus, having particular relation to substations. One object of my invention is to provide a system of the character described, which shall be characterized by the more eflicient transmission and articulation afforded on strong currents; by the elimination of side tone; and by the tendency to amplify weak currents.

Another object of my invention is to provide a transformer for use in telephone substation sets that shall require a minimum amount of wire but yet having a maximum number of turns; said transformer being further characterized by its low direct current resistance, and by thc exceedingly small core that is required.

A further object of my invention is to provide a telephone system, wherein the receiver and transmitter are connected in such relation to the above-noted transformer that the system shall have highly desirable operating characteristics. I

Other applications of my invention, as well v 5 as details of construction and operation in certain arrangement, willappear more fully hereinafter when taken in connection with the accompanying drawing, wherein The drawing is a diagrammatic view of circuits and apparatus embodying my invention.

In the illustrated embodiment of my invention shown in the drawing, a transformer 1 is provided with windings 2, 3 and 4;, which may be successively positioned on a single core The windings 2 and 3, which may constitute the inner and intermediate windings of the transformer 1, are connected in series-circuit relation, so as to aid one another. The respective terminals 6 and 8 are connected to 59 conductors 10 and 11 which. constitute a line circuit 12. The line circuit 12 may include a source of energy 13 and the usual retardation coils 14 and it is also provided with a transmitter 15 which may be connected in the conductor 10. A transmitter circuit is thus formed which includes the series-connected primary windings 2 and 3 as well as the line circuit 12. I

In accordance with my invention, the third winding d of the transformer 1 has'its terminal 9 connected by a conductor 16 to the terminal 7, so that this winding is connected in opposition .to the winding 2. A receiver 17 may be connected to a portion 18 of the transformer 1 which extends between the end of the coil 3, defined by the terminal 8, and the 7 end of the coil 4 opposite to the terminal 9. The receiver 17 may also be connected in the conductor 16, if desired. A receiver-circuit 19 is thus formed, extending from the terminal 7 to the terminal 8, and including the coil 45 and the receiver 17 so that the two are connected in shunt relation to the coil 3.

In the, operation of a telephone systemas just described, I have found that a greater volume and better! articulation are obtained by the transformer on weak currents, and that side tones are eliminated. Furthermore, the core 5 of the transformer 1 may be made considerably smaller than has heretofore been the practice, and the overall direct current resistance of the transformer also'decreased.

Attention is also directed tothe fact that the usual condenser is not necessary to satisfactory operation.

Whilel have shown only one embodiment of my invention for the purpose of describing the same andillustrating its principles of construction and operation, it is apparent that various changes and modifications may be made therein, without departing from the spirit of my invention, and I desire, therefore, that only such limitations shall be imposed thereon as are indicated in the appended claims or as disclosed by the prior art.

- I claim:

1. In a telephone system, a receiver, a transmitter, a transformer having at least three windings, of which one is connected in series circuit relation with said receiver and windings, and a line including said transmitter connect-ed to said transformer.

2. In a telephone system, the comblnation with a receiver and a transmitter, of a transformer having three windlngs, one of sa1d.

windings being connected in series-circuit relation with said receiver but in shunt relation to one of the remaining pair of windings, said pair of windings being serially connected, and a line connected across said pair of windings, said line including said transmitter and a source of energy.

3. In a system of the character described, a transformer having three windings, two of which are connected oppositely with respect to the third, a receiver, and a circuit including said third winding and said receiver, said circuit being in multiple with respect to one of the remaining windings.

4:. In a system of the class described, a transformer having three windings, a line circuit including a transmitter, and a receiver circuit, said circuits being so connected to said transformer as to each include a pair of windings with but one in common.

5. In combination, a transformer having three windings, a transmitter circuit including a source of energy and a transmitter, and a receiver circuit, said transmitter circuit being so connected to said transformer as to includetwo of said windings, said receiver circuit including the remaining winding and connected in shunt relation to one of said pair of windings.

6. In combination, a transformer having three windings, a transmitter circuit including a source of energy and a transmitter, and a receiver circuit, said transmitter circuit being so connected to said transformer as to include two of said windings, said receiver circuit including the remaining winding and connected in shunt relation to one of said pair of windings, the winding in the receiver circuit opposing one of the windings of the transmitter circuit.

v 7 In a system of the character described,

the combination with a transformer having three connected windings, of a circuit having a receiver therein, a transmitter, a source of energy, and a line circuit including said transmitter and source of energy, said line circuit including two of said windings which are oppositely connected with respect to the third, said receiver circuit including said third winding and connected in multiple to one of said first-mentioned pair of windings.

8. A transformer having three windings and three terminal connections, a receiver circuit, a transmitting circuit, said circuits being sov connected to said terminals as to have only one winding and one terminal connection'in common, and a receiver connected between said common terminal connection and the winding 1n sa1d receiver c1rcuit.

9. In a telephone system, a transformer having at least three windings and three terminal connections, a receiver circuit, and a line having a transmitter forming a transmitting circuit, said circuits being so connected to said terminals as to have one winding and one terminal connection in common, said transmitting circuit including a pair of windings.

10. Ina telephone. system, a transformer having a pair of serially connected coils, a line connected across said pair of coils, of which one coil serves to aid the other, a third coil of said transformer being connected in shunt relation to one of said pairof coils and constituting a retarding coil, and a receiver connected in series-circuit relation with said last-mentioned coil.

11. In a telephone system, the combination with a line having a transmitter and a source of energy therein, of a transformer having a pair of coils connected across said line, said coils being serially connected so that one coil aids the other, said transformer having a third coil connected in shunt relation to one of a pair of coils, and a receiver connected in series-circuit relation with said last-men-' tioned coil. 7

12. In combination, a transformer having three windings and three terminal connections, a line circuit including a transmitter and a source of energy, said line being connected across a pair of said coils, said pair of coils being serially connected, one of said pair of coils serving to aid the other, and a circuit including said receiver and adapted to connect the third coil across one of said pair of coils. JOHN H. MASON. 

